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GERB-CERES comparisons: Progress towards GERB data release

GERB-CERES comparisons: Progress towards GERB data release. S. Dewitte Royal Meteorological Institute of Belgium. Methodology. Unfiltered radiance comparison: validation calibration + unfiltering Reflected solar radiance Emitted thermal radiance: night + day

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GERB-CERES comparisons: Progress towards GERB data release

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  1. GERB-CERES comparisons: Progress towards GERB data release S. Dewitte Royal Meteorological Institute of Belgium

  2. Methodology • Unfiltered radiance comparison: validation calibration + unfiltering • Reflected solar radiance • Emitted thermal radiance: night + day • Additional flux comparison: validation scene id + ADM • Additional regional analysis: scene dependence differences

  3. Used data • GERB: ARG product, Version ‘999’: reprocessed version with new spectral response (mainly SW) + empirical ADM correction for thermal fluxes • CERES FM2 and FM3: RAPS or GERB mode or special scan, ES8, Edition 2 + Rev. 1 (SW) • 6-7/2004 • CERES data is colocated to nearest GERB ARG pixel

  4. Solar radiance scatter plot FM3

  5. Reflected solar radiance

  6. FM3 solar flux scatter plot

  7. Reflected solar flux

  8. Emitted thermal radiance scatter plot FM3

  9. Emitted thermal radiance

  10. Emitted thermal flux scatter plot FM3

  11. Emitted thermal flux

  12. Summary flux differences

  13. Regional distribution FM3

  14. GERB – 1.06 * CERES FM3

  15. GERB – CERES FM2

  16. GERB – 1.06 * CERES FM2

  17. Conclusions • With new GERB spectral response reflected solar fluxes are about 6% higher then CERES. • Net GERB flux is about 2 W/m2 higher then CERES. • Regional differences are mostly within +/- 30 W/m2 after scale homogenisation. • Identifiable problem in clear sky sun-glint region due to cloud detection difficulty.

  18. GERB - CERES FM3 (day)

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